"Chlorine" is a song written and recorded by the American musical duo Twenty One Pilots. The song was released as the fifth single from their fifth studio album, Trench, on January 22, 2019 by Fueled by Ramen. The track was written and produced by lead singer Tyler Joseph and Paul Meany of rock band Mutemath. Upon the song's release as a single, a music video directed by Mark C. Eshleman was uploaded. The song peaked at number 12 on the Bubbling Under Hot 100 chart.

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